JP2008008210A - Engine control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine control device providing high reliability especially by prevention of rust of an outer circumference end surface (cut surface) of a cover in addition to water proofing property and dust proofing property, while keeping manufacturing cost low. <P>SOLUTION: This device is provided with a circuit board 12 for engine control, an aluminum die-cast case body 20 having an upper surface thereof opened and storing the circuit board 12 or the like, a cover 30 made of ferrous metal plate having surface treatment applied beforehand thereon such as plated steel plate fastened and fixed on the case body 20 by a setscrew 40 to close the upper surface opening of the case body 20. A pedestal 24 or a groove 25 to which liquid or jelly water proofing adhesive 50 is applied or deposited is provided at the upper surface opening part of the case body 20 for sealing an inside of the case body 20, and the whole outer circumference end surface 33a of the cover 30 is embedded in the water proofing adhesive 50 applied or deposited to the pedestal 24 or the groove 25 and is substantially coated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine control device, and in particular, includes a case main body having an upper surface opened and a cover fastened and fixed to the case main body with a set screw so as to close the upper surface opening. It is related with what put the adhesive for waterproofing in between.

  Conventionally, a storage case for storing a circuit board for engine control or the like generally has a waterproof structure from the viewpoint of waterproofness, dustproofing and rustproofing. There are two main waterproof structures: a molded elastic member (sealing material) sandwiched between the case body and the cover to give a tight force, and a waterproof structure using a liquid or jelly-like waterproof adhesive. (For example, see Patent Document 1 below).

JP 2001-85858 A

  However, depending on the usage environment, especially when used in environments where rust prevention is severely required, plated steel sheets, etc. that are low in manufacturing costs (such as those in which surface treatment such as plating is applied to ferrous metal sheets in advance) The cover made by punching press molding or the like using the material as a raw material has a problem in that rust is generated on the outer peripheral end surface (cut surface) that is not plated, and the commercial value is lowered.

  Conventionally, this problem has been dealt with by plating the outer peripheral surface later, or changing the cover material from iron to aluminum. However, such measures increase the manufacturing cost. The engine control device including the storage case becomes expensive.

  The present invention has been made to solve the above-described conventional problems, and its object is to keep the manufacturing cost low, and in addition to waterproofness and dustproofness, in particular, the outer peripheral end surface (cut surface) of the cover. It is possible to provide an engine control device that can prevent rust from being generated and can obtain high reliability.

  In order to achieve the above object, one of the engine control devices according to the present invention basically includes a circuit board for engine control, and a case body made of aluminum die-casting with an upper surface in which the circuit board is accommodated. And a cover made of an iron-based metal plate, such as a plated steel plate, which is fastened and fixed to the case body with a set screw so as to close the upper surface opening of the case body.

  In order to seal the inside of the case body, a pedestal or groove to which a liquid or jelly-like waterproof adhesive is applied or placed is provided in the upper surface opening of the case body, and the pedestal or groove is coated or placed. The outer peripheral end surface of the cover is substantially covered with the waterproof adhesive. The outer peripheral end surface of the cover is substantially covered with the waterproof adhesive.

  Another one of the engine control devices according to the present invention is based on the above-described basic configuration, from the tightening fixing portion of the cover by the set screw of the case body so as to seal the inside of the case body. A liquid or jelly-like waterproof adhesive is interposed between the case main body and the cover on the inner peripheral side, and the outer peripheral side of the tightening and fixing portion so as to seal the tightening and fixing portion. A liquid or jelly-like waterproof adhesive is interposed between the case main body and the cover.

  The cover is preferably manufactured by punching and pressing using an iron-based metal plate whose surface is previously plated.

  In another preferred embodiment, the cover has an inverted dish shape or a hat shape having a bowl-shaped portion, and is substantially formed of a waterproof adhesive in which the entire outer peripheral end surface of the bowl-shaped portion is applied to or mounted on the pedestal or groove. Coated.

  In this case, in a preferred embodiment, the outer peripheral end portion of the hook-shaped portion in the cover is bent downward.

  In another preferred embodiment, the case main body and the cover are rectangular in a plan view, and the fastening fixing portions are provided at four corners of the case main body.

  In another preferred aspect, an internal thread portion into which the set screw is screwed is provided in the tightening fixing portion, and an upper end portion of the tightening fixing portion is provided so that the waterproof adhesive does not flow into the internal thread portion. A projecting portion is provided on the projection. In this case, preferably, at least one notch groove for air venting is formed in the convex portion.

  In the engine control device of the present invention, the entire outer peripheral end surface (cut surface) of the cover is embedded and substantially covered with, for example, a waterproof adhesive placed on a pedestal provided in the case body. The outer peripheral end face is prevented from coming into contact with air, and as a result, the generation of rust can be reliably prevented. For this reason, it is possible to ensure high rust resistance in addition to high waterproof and dustproof properties even in harsh environments by using inexpensive ferrous metal plates such as plated steel sheets for the cover, thereby reducing costs and improving reliability. Effectively.

  Further, a waterproof adhesive is interposed between the case main body and the cover on the inner peripheral side from the case body tightening fixing portion so as to seal the inside of the case main body, and the tightening fixing portion is A waterproof adhesive is also inserted between the case body and the cover on the outer peripheral side of the tightening and fixing part so as to seal, thereby reliably preventing rust generation and loosening at the set screw. And reliability can be further improved.

  Embodiments of an engine control apparatus according to the present invention will be described below with reference to the drawings.

  1 and 2 are a schematic exploded perspective view and a cross-sectional view, respectively, showing an embodiment of an engine control device according to the present invention.

  The engine control apparatus 1 of the illustrated embodiment is of an electronic control type by a microcomputer, and exchange of signals between the circuit board 12 for engine control and the circuit board 12 and external devices (various sensors and actuators). Connector 15 for carrying out the operation, a case main body 20 having an upper surface in which the circuit board 12 and the like are accommodated, and a set screw (hexagonal bolt with washer) on the case main body 20 so as to close the upper surface opening of the case main body 20 And a cover 30 fastened and fixed at 40.

  On the circuit board 12, electronic parts (computer parts) for engine control are mounted and a predetermined wiring pattern is formed. Specifically, as schematically shown in FIG. 7, the CPU 101, the ROM 102, the RAM 103, and the input / output port 104 connected to each other by a bus, and various sensors such as a crank angle sensor and a water temperature sensor. An input circuit 105 to which a detection signal from the input is input via the connector 15 and various actuator drive circuits such as an ignition output circuit 111 and an injection valve drive circuit 112, and the ignition output circuit 111 and the injection valve A drive control signal is output from the various actuator drive circuits such as the drive circuit 112 to the various actuators such as the spark plug 121 and the fuel injection valve 122 via the connector 15 at a predetermined timing.

  The case body 20 is made of aluminum die-casting and has a rectangular box shape in plan view having front and rear side walls 20a, 20b, 20c, 20d and a stepped bottom wall 20e (shallow front side). (Upper surface) is provided with a plurality of support columns 27 on which the circuit board 12 is placed and fastened and fixed with a set screw 40, and a plurality of cooling fins 28 are provided on the lower surface thereof. ing.

  In addition, at the four corners of the case body 20, there are provided fastening bases (tightening fixing portions) 22 that are pressed against the four corners of the cover 30 (the hook-like portion 32) and fastened and fixed by the set screws 40. The connector 15 is attached to the rear side wall 20d.

  Then, on the inner peripheral side of the side walls 20a, 20b, 20c, 20d (including the tightening pedestal 22 part and the upper surface standing wall 15b part of the connector 15) that form the upper surface opening, the step is made from the tightening pedestal 22 over the entire circumference. A lowered pedestal 24 on which the waterproofing adhesive 50 is lowered is provided, and also on the outer peripheral side (side walls 20a, 20b, 20c, 20d side) of the fastening pedestal 22, There is provided a grooved groove 25 on which the bottom surface is flush with the waterproofing adhesive 50.

  Here, as the waterproofing adhesive 50, a jelly-like adhesive having a certain degree of shape-retaining property that is higher in viscosity than liquid and does not flow when placed is used. The jelly-like waterproof adhesive 50 is commercially available, and it takes 3 to 4 days at room temperature to cure. However, when it is heated to about 100 ° C., it is cured in about 1 hour.

  On the other hand, the cover 30 has a flange-like portion 32 (the outer peripheral end portion 33 is bent downward) by punching and pressing a plated steel plate, which is an iron-based metal plate whose surface is previously plated. The bottom end surface 33 a of the outer peripheral end portion 33 of the bowl-shaped portion 32 is an outer peripheral end surface (cut surface) that is not plated on the cover 30. There is a problem that rust is generated when the end face 33a comes into contact with air.

  Therefore, in the present embodiment, a structure for attaching the cover 30 to the case body 20 and a waterproof structure and a rust preventive structure using the waterproof adhesive 50 are adopted as follows.

  That is, before attaching the cover 30 to the case body 20, the jelly-like waterproofing adhesive 50 is placed on the pedestal 24 and the groove 25 with a predetermined width and thickness so as not to overflow from there. . In this case, the waterproof adhesive 50 is placed above the upper surface of the tightening pedestal 22 so that the lower surface of the bowl-shaped portion 32 of the cover 30 and the waterproof adhesive 50 are in close contact with the serving base 24 without generating a gap. So that it protrudes into the shape (so that it has a cross-sectional shape). Further, the waterproofing adhesive 50 is embedded in the filling groove 25 so that the upper surface of the waterproofing adhesive 50 is lower than the upper surface of the fastening base 22 (the outer peripheral end surface 33a of the hook-like portion 32 is embedded in the waterproofing adhesive 50. So as not to overflow)

  Thereafter, the cover 30 (the four corners of the hook-shaped portion 32) is placed on the fastening base 22, and the outer peripheral end surface 33a of the hook-shaped portion 32 is mounted on the pedestal 24 and the groove 25. It is buried by being pushed into the agent 50. In this case, the dimensions and the like of each part are set such that a predetermined gap α is formed between the outer peripheral end surface 33a and the pedestal 24 (the upper surface thereof and the bottom surface of the grooving groove 25).

  Thereafter, the cover 30 is fastened and fixed to the case body 20 by screwing the set screw 40 into the female screw portion 26 provided in the fastening fixing portion 22 through the insertion hole 34 formed in the flange-like portion 32 of the cover 30. .

  As a result, when the waterproof adhesive 50 is cured, the inside of the case body 20 and the cover 30 is sealed with the waterproof adhesive 50, and the entire outer peripheral end face 33 a of the cover 30 embedded in the waterproof adhesive 50. Is substantially covered with the waterproof adhesive 50, and the waterproof adhesive 50 provided on the pedestal pedestal 24 provided on the inner peripheral side of the tightening pedestal 22 is formed on the waterproof adhesive 50. The bottom surface is in close contact.

  Thus, in the engine control device 1 of the present embodiment, the entire outer peripheral end surface (cut surface) 33a of the cover 30 is 50 in the waterproof adhesive placed on the base 24 and the groove 25 provided in the case body 20. Since the outer peripheral end face 33a is prevented from coming into contact with air, the generation of rust can be reliably prevented. For this reason, it is possible to ensure high rust resistance in addition to high waterproof and dustproof properties even in harsh environments by using inexpensive ferrous metal plates such as plated steel sheets for the cover, thereby reducing costs and improving reliability. Effectively.

  Further, a waterproof adhesive is interposed between the case body 20 and the cover 30 on the inner peripheral side of the case body 20 so as to seal the inside of the case body 20, and A waterproof adhesive 50 is also interposed between the case main body 20 and the cover 30 on the outer peripheral side of the tightening / fixing part 22 so as to seal the tightening / fixing part 22, so that the set screw 40 It is possible to reliably prevent the occurrence of rust and slack in the steel, and further increase the reliability.

  FIG. 3 shows another embodiment of the engine control apparatus according to the present invention. The engine control device 2 according to the present embodiment copes with a case where the outer peripheral end portion 33 of the hook-shaped portion 32 of the cover 30 cannot be bent downward as in the above-described embodiment due to the thickness of the cover 30 or the like. In the engine control apparatus 2 shown in the figure, only the four corner portions 32A of the hook-shaped portion 32 of the cover 30 are placed on the tightening base 22 ′ where the grooving groove 25 is not formed, and the hook-shaped portion The four corner portions 32A of the four corner portions 32A are bent downward (downward bent portions 32B), and the outer peripheral end surface 32a of the four corner portions 32A is disposed perpendicularly to the base 22 'and is substantially covered with the waterproofing adhesive 50. The outer peripheral end surface 32b of the downward bent portion 32B is horizontally arranged with a predetermined gap β from the upper surface of the pedestal pedestal 24 and embedded in the waterproofing adhesive 50 laid on the pedestal pedestal 24. Yes.

  Also in the engine control device 2 having such a configuration, substantially the same operational effects as those of the above-described embodiment can be obtained.

  FIG. 4 shows another embodiment of the engine control apparatus according to the present invention. In the illustrated engine control device 3, the structure of the case main body 20 and the cover 30 is the same as that shown in FIG. 3, but after the cover 30 is fastened and fixed to the case main body 20 by the set screw 40, the four corner portions 32A are formed. On the pedestal 22 ′ to be placed, the waterproofing adhesive 50 is placed not only at the outer peripheral end face 32a but also up to a height at which the head of the set screw 40 is buried (in this case, it is more viscous than the jelly-like one) A low liquid waterproofing adhesive may be used). As described above, the waterproof adhesive 50 may be placed after the cover 30 is tightened and fixed. In this case, the same effect as that of the above embodiment can be obtained.

  FIG. 5 shows that the waterproof adhesive 50 does not flow into the female thread portion 26 provided in the center of the fastening base 22 when the cover 30 is attached in the engine control apparatus 1 of the embodiment shown in FIGS. Therefore, a convex portion 22 a having a rectangular cross-sectional outer shape is provided on the upper end portion of the tightening base 22 so as to project. Since the female screw part 26 into which the set screw 40 is screwed is provided at the center of the fastening base 22 including the convex part 22a, the shape of the convex part 22a is as shown in FIG. It becomes a short cylindrical shape (or short rectangular tube shape).

  In addition, in order to facilitate the fastening and fixing of the cover 30 by the set screw 40 (air venting in the female thread portion 26), the upper end side of the convex portion 22a has a V-shaped cross section (U-shaped, semicircular, At least one notch groove 22s (which may be a rectangle or the like) is formed.

  Thus, by providing the convex portion 22a with the air notch groove 22s, it becomes difficult for the waterproofing adhesive 50 to flow into the female screw portion 26. As a result, it is convenient when the cover 30 is fastened and fixed by the set screw 40. In addition, the set screw 40 can be prevented from being loosened.

1 is a schematic exploded perspective view showing an embodiment of an engine control device according to the present invention. The engine control apparatus shown by FIG. 1 is shown, (A) is sectional drawing, (B) is an enlarged view of the B section of (A). The partial expanded sectional view which shows other embodiment of the engine control apparatus which concerns on this invention. The partial expanded sectional view which shows another embodiment of the engine control apparatus which concerns on this invention. The partial expanded sectional view which shows the modification of the engine control apparatus shown by FIG. 1, FIG. The partial expansion perspective view which shows the detailed shape of the convex part provided in the clamping base shown by FIG. The block diagram which shows typically the circuit structure of the circuit board shown by FIG. 1, FIG.

Explanation of symbols

1, 2, 3 ... engine control device 12 ... circuit board 15 ... connector 20 ... case main body 22 ... tightening base 22a ... convex portion 22s ... notch groove 24 ... fill base 25 ... fill groove 26 ... female thread 30 ... cover 32 ... bowl-shaped part 33 ... outer peripheral end parts 33a, 32a, 32b ... outer peripheral end face 40 ... set screw 50 ... waterproofing adhesive

Claims (8)

  A circuit board for engine control, a case body made of aluminum die-casting with an open top surface for storing the circuit board and the like, and a fastening screw fixed to the case body so as to close the top surface opening of the case body A cover made of an iron-based metal plate that has been subjected to surface treatment in advance, such as a plated steel plate, and in order to seal the inside of the case body, a liquid or jelly-like waterproofing is provided in the upper surface opening of the case body An engine characterized in that a pedestal or groove on which an adhesive is applied or placed is provided, and the outer peripheral end surface of the cover is substantially covered with a waterproofing adhesive applied or placed on the pedestal or groove. Control device.   A circuit board for engine control, a case main body made of aluminum die-casting with an open upper surface to be accommodated such as the circuit board, and the case main body tightened and fixed with a set screw so as to close the upper surface opening of the case main body, A cover made of a ferrous metal plate that has been previously surface-treated, such as a plated steel plate, and the cover body is tightened and fixed by the set screw of the case body so as to seal the inside of the case body A liquid or jelly-like waterproof adhesive is interposed between the case main body and the cover on the inner peripheral side of the part, and the fastening fixing part is sealed so as to seal the fastening fixing part. An engine control device characterized in that a liquid or jelly-like waterproof adhesive is interposed between the case main body and the cover on the outer peripheral side.   The engine control device according to claim 1 or 2, wherein the cover is made by punching and pressing an iron-based metal plate whose surface is previously plated.   The cover has an inverted dish shape or hat shape having a hook-shaped portion, and the entire outer peripheral end surface of the hook-shaped portion is substantially covered with a waterproofing adhesive applied or placed on the pedestal or groove. The engine control device according to any one of claims 1 to 3, wherein   The engine control device according to claim 4, wherein an outer peripheral end portion of the bowl-shaped portion of the cover is bent downward.   The engine control device according to any one of claims 1 to 5, wherein the case main body and the cover are rectangular in a plan view, and the fastening fixing portions are provided at four corners of the case main body. .   A female screw portion into which the set screw is screwed is provided in the tightening fixing portion, and a convex portion is provided on the upper end portion of the tightening fixing portion so as to prevent the waterproof adhesive from flowing into the female screw portion. The engine control device according to any one of claims 1 to 6, wherein the engine control device is provided.   The engine control device according to claim 7, wherein at least one notch groove for venting air is formed in the convex portion.

Images